EP0386309B1 - Injection molding nozzle with self-supporting actuating mechanism - Google Patents

Injection molding nozzle with self-supporting actuating mechanism Download PDF

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Publication number
EP0386309B1
EP0386309B1 EP89114134A EP89114134A EP0386309B1 EP 0386309 B1 EP0386309 B1 EP 0386309B1 EP 89114134 A EP89114134 A EP 89114134A EP 89114134 A EP89114134 A EP 89114134A EP 0386309 B1 EP0386309 B1 EP 0386309B1
Authority
EP
European Patent Office
Prior art keywords
valve member
rear end
extends
main body
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89114134A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0386309A2 (en
EP0386309A3 (en
Inventor
Jobst Ulrich Gellert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mold Masters 2007 Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0386309A2 publication Critical patent/EP0386309A2/en
Publication of EP0386309A3 publication Critical patent/EP0386309A3/en
Application granted granted Critical
Publication of EP0386309B1 publication Critical patent/EP0386309B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—Drive means therefor

Definitions

  • This invention relates generally to injection molding and more particularly to a heated nozzle as indicated in the preamble of claim 1.
  • Valve gated injection molding systems with each valve pin or member extending through a heated nozzle are well known.
  • An early example of a mechanically actuated valve member is shown in the applicant's U.S. patent number 4,222,733 which issued September 16, 1980.
  • Pneumatic and hydraulic actuating mechanisms are also known as described in the applicant's U.S. patent number 4,433,969 which issued February 28, 1984 and U.S. patent number 4,698,013 to Butcher which issued October 6, 1987. More recently, a system for mechanically actuating the whole nozzle is described in the applicant's U.S. patent number 4,787,840 which issued November 29, 1988.
  • an object of the invention to at least partially overcome the problems of the prior art by providing an injection molding nozzle with an improved valve member actuating mechanism.
  • the present application provides an injection molding nozzle as indicated in the preamble portion of claim 1, said nozzle being characterised by a rearwardly facing flange portion, a forwardly facing flange portion surrounding the valve member and extending rearwardly from the rear end of the main body portion, a forwardly facing flange portion surrounding the valve memberand extending forwardly from the cylinder assembly, the forwardly facing flange portion being removably secured to the rearwardly facing flange portion by clamping means, the clamping means including first and second opposed portions which are tightened together over said flange portions by laterally extending tightening means, whereby the actuating mechanism is securely mounted on the rearwardly facing flange portion to engage the driven end of the valve member to reciprocate the valve member between the open and closed positions.
  • FIGS 1 and 2 show a portion of a valve gated injection molding system having several heated nozzles 10 attached in different orientations to an elongated steel manifold 12.
  • the heated nozzles 10 each have a steel main body 14 with a rear end 16, a forward end 18, and a central bore 20 extending therebetween.
  • Each nozzle 10 has an integral side portion 22 with a side face 24 adjacent the rear end 16 which is attached to the side surface 26 of the manifold 12 by bolts 28.
  • the side portion 22 has central raised flange portion 30 which is received in a seat 32 in the side surface 26 of the manifold 12.
  • Each nozzle 10 extends into a well 34 in a mold core or cavity plate 36 with an insulative air space 38 provided between the heated nozzle 10 and the surrounding cooled mold cavity plate 36.
  • the nozzle 10 has a seal insert 40 which is screwed into the forward end 18 of the main body 14 to bridge the air space 38.
  • the seal insert 40 has a cylindrical nose portion 42 which is received in a seat 44 around a gate 46 through the cavity plate 36 leading to a cavity 48.
  • the nozzle 10 is located in a position in which the central bore 20 is in alignment with the gate 46, and the seal insert 40 has a tapered bore 50 which extends from the central bore 20 of nozzle 10 to the gate 46.
  • the elongated manifold 12 is located relative to the cavity plate 36 by a locating ring 51 to provide an insulative air space 53 between them.
  • the manifold 12 has a longitudinal melt bore 52 which extends from an inlet 55 from which branch a number of lateral outlet bores 54.
  • Each nozzle 10 has a melt passage 56 with a lateral portion 58 and a longitudinal portion 60.
  • the lateral portion 58 extends from an inlet 62 on the side face 24 which aligns with one of the lateral outlet bores 54 of the manifold 12, and the longitudinal portion 60 extends around an elongated valve member 64 which is received in the central bore 20 to an outlet 66 at the forward end 18 leading to the gate 46.
  • the heating element 70 has a chrome nickel resistance wire extending centrally through a refractory powder insulating material such as magnesium oxide inside a steel casing. It has a helical portion 72 which is brazed in a channel in the outer surface of the main body 14 and covered by a protective coating which is applied as described in the applicant's U.S. patent number 4,768,283 which issued September 6, 1988.
  • the helical portion 72 of the heating element 70 encircles the longitudinal portion 60 of the melt passage 56 with a pitch which varies according to a predetermined configuration to maintain the melt flowing through the melt passage 56 at a more uniform temperature.
  • the cavity plate 36 is cooled by pumping cooling water through cooling conduits 74.
  • the elongated valve member 64 has a forward end 76 which is seated in the gate 46 in the forward closed position and a portion 78 which extends rearwardly from the rear end 16 of the main body 14 of the nozzle 10 to an enlarged driven rear end 80.
  • the driven rear end 80 of the valve member 64 is engaged by the pneumatic actuating mechanism 82 which is mounted on the rear end 16 of the main body 14 of the nozzle 10 as now described with particular reference to Figure 3.
  • a steel connector member 84 having a sealing sleeve portion 86 extending therefrom is securely fixed to the rear end 16 of the main body 14 of the nozzle 10 by bolts 88 which extend through holes 90 into the main body 14 of the nozzle 10.
  • the sealing sleeve portion 86 is seated in the central bore 20 and fits around the valve member 64 to prevent leakage of pressurized melt as the valve member 64 reciprocates.
  • the sealing sleeve portion 86 of the connector member 84 extends into the central bore 20 to where the lateral portion 58 of the melt passage 56 joins the longitudinal portion 60, and the forward end of the sealing sleeve portion 86 is shaped to redirect the melt around the bend between them.
  • the connector member 84 has a rearwardly extending flange portion 92 with a tapered outer surface 94 and a rear face 96.
  • the rearwardly extending portion 78 of the valve member 64 passes through the central bore 98 of the connector member 84 into a cylinder assembly 100.
  • the cylinder assembly 100 includes a piston 102 which reciprocates in a cylinder 104 which is formed by attaching a rear plate portion 106 to a forward portion 108 having a cylindrical outer wall 110 with bolts 112.
  • the piston 102 has a hollow neck portion 114 which is received in a central bore 116 which extends forwardly through a high pressure seal 118 seated in the forward portion 108 of the cylinder 104.
  • the valve member 64 extends through the neck portion 114 and the enlarged head 120 at the rear end 80 of the valve member and is secured to the piston 102 by a circular plate 122 which is fixed to the piston 102 by bolts 124 with an O-ring 125 to prevent leakage.
  • the cylinder assembly 100 also has a flange portion 126 with a tapered outer surface 128 which extends forwardly to a forward face 130.
  • the cylinder assembly 100 is secured to the connector member 84 by a wedge clamp 132 which encircles the matching flange portion 92 of the connector member 84 and the flange portion 122 of the cylinder assembly 100.
  • the system is assembled as shown and electrical power is applied to the plate heater 68 and the heating element 70 to heat the manifold 12 and the nozzle 10 to a predetermined operating temperature.
  • Pressurized melt from a molding machine (not shown) is then injected into the manifold melt bore 52 located at a recessed inlet 144 in a locating ring 146 according to a predetermined operating cycle.
  • Pneumatic pressure is also applied to each cylinder 104 according to the cycle to position the valve member in the retracted open position when he injection melt pressure is applied.
  • the melt flows through the melt passage 56 in each nozzle 10 and through the gates 46 to fill the cavity 48.
  • injection pressure is held momentarily to pack and pneumatic pressure is then applied to each cylinder 104 to drive the valve members 64 to the forward close position in which the forward end 76 of each valve member 64 is seated in a respective gate 46.
  • Injection pressure is then released and after a short cooling period, the mold is opened along the parting ling 148 to eject the molded product.
  • the mold is closed and pneumatic pressure is reapplied to the cylinders 104 to withdraw the valve members 64 to the open position and injection pressure is reapplied to refill the cavity 48. This cycle is repeated continuously with a frequency dependent upon the size of cavity and type of material being molded.
  • the injection molding system having nozzles with self-supported actuating mechanism has been given with respect to a preferred embodiment, it is not to be construed in a limiting sense. Variations and modifications will occur to those skilled in the art.
  • the actuating mechanism can have a different configuration and can be hydraulically actuated.
  • the cylinder assembly 100 can be attached to the main body 14 of the nozzle 10 by bolts, rather than being clamped to the connector member 84. Reference is made to the appended claims for a definition of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP89114134A 1989-02-28 1989-07-31 Injection molding nozzle with self-supporting actuating mechanism Expired - Lifetime EP0386309B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000592346A CA1274369A (en) 1989-02-28 1989-02-28 Injection molding nozzle with self-supporting actuating mechanism
CA592346 1989-02-28

Publications (3)

Publication Number Publication Date
EP0386309A2 EP0386309A2 (en) 1990-09-12
EP0386309A3 EP0386309A3 (en) 1991-07-03
EP0386309B1 true EP0386309B1 (en) 1995-04-12

Family

ID=4139701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114134A Expired - Lifetime EP0386309B1 (en) 1989-02-28 1989-07-31 Injection molding nozzle with self-supporting actuating mechanism

Country Status (8)

Country Link
US (1) US4979892A (ja)
EP (1) EP0386309B1 (ja)
JP (1) JP2716539B2 (ja)
CN (1) CN1032959C (ja)
AT (1) ATE121005T1 (ja)
CA (1) CA1274369A (ja)
DE (2) DE3925332A1 (ja)
ES (1) ES2070872T3 (ja)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2008170C (en) * 1990-01-19 1997-04-22 Jobst Ulrich Gellert Injection molding manifold and nozzle having laterally clamped flanges
CA2041850A1 (en) * 1991-05-06 1992-11-07 Jobst Ulrich Gellert Injection molding apparatus with heated valve member
US5106291A (en) * 1991-05-22 1992-04-21 Gellert Jobst U Injection molding apparatus with heated valve member
US5192556A (en) * 1991-10-03 1993-03-09 Husky Injection Molding Systems Ltd. Plastic molding apparatus for equalizing flow pressure and flow velocity of plastic melt
US5372496A (en) * 1993-02-18 1994-12-13 Taniyama; Yoshihiko Ejector valve plastic molding apparatus
US5635227A (en) * 1995-06-07 1997-06-03 R & D Tool And Engineering, Inc. Replaceable air cylinder unit and valve gate for injection molding machines
US7172411B2 (en) * 2003-06-20 2007-02-06 Mold-Masters Limited Injection molding manifold with multi-axis adjustable manifold blocks and nozzles
DE102007050332B4 (de) * 2007-10-18 2010-12-02 Kraussmaffei Technologies Gmbh Formwerkzeug mit integriertem Injektor
US7708551B2 (en) * 2008-01-30 2010-05-04 Husky Injection Molding Systems Ltd. Reconfigurable hot runner
US7771189B2 (en) * 2008-03-03 2010-08-10 R&D Tool & Engineering Co. Injection molding apparatus with replaceable gate insert
WO2011008583A1 (en) * 2009-07-17 2011-01-20 Husky Injection Molding Systems Ltd Modular manifold system
US7997895B1 (en) 2010-04-06 2011-08-16 Mold Hotrunner Solutions Inc. Injection apparatus for injection molding of thermoplastic parts
US8047836B2 (en) 2010-04-06 2011-11-01 Mold Hotrunner Solutions Inc. Nozzle valve gate apparatus with wiper seal
CN114953544B (zh) * 2022-05-26 2024-03-08 山东中鲁管业有限公司 一种耐磨损的高分子管材生产工艺及装置

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195186A (en) * 1962-06-13 1965-07-20 Inv S Finance Corp Apparatus for clamping mold parts
IL34598A (en) * 1969-06-07 1974-03-14 Katashi Aoki An injection molding machine
US3716318A (en) * 1971-02-04 1973-02-13 Gte Sylvania Inc Valving means for injection molding apparatus
DK138213B (da) * 1975-10-10 1978-07-31 Eduard Freddy Flygenring Nåleventil med nål til indsprøjtningsdyser til formstofstøbeforme.
CA1097873A (en) * 1978-12-14 1981-03-24 Jobst U. Gellert Injection molding flow control mechanism
US4433962A (en) * 1981-02-17 1984-02-28 Kloss Henry E Process for making envelope for projection television tube
CA1190018A (en) * 1982-07-12 1985-07-09 Jobst U. Gellert Injection molding valve pin bushing and method
US4698013A (en) * 1986-10-20 1987-10-06 Butcher Robert M Mechanism for valve gated injection molding with resilient retaining ring
CA1252972A (en) * 1986-10-30 1989-04-25 Harald H. Schmidt Dual feed single cavity injection molding system
CA1252973A (en) * 1986-12-01 1989-04-25 Harald H. Schmidt Side mounted manifold block for variable orientation of injection molding nozzle
CA1265907A (en) * 1987-02-17 1990-02-20 Jobst U. Gellert Injection molding system having manifold with side mounted nozzles and method
CA1267514A (en) * 1987-07-15 1990-04-10 Jobst Ulrich Gellert Coated injection molding nozzle and method
CA1266358A (en) * 1987-10-16 1990-03-06 Jobst Ulrich Gellert Injection molding system having clamped rotatable nozzles and method
CA1261571A (en) * 1987-12-17 1989-09-26 Jobst U. Gellert Injection molding single nozzle valve gating

Also Published As

Publication number Publication date
ATE121005T1 (de) 1995-04-15
DE3925332A1 (de) 1990-09-06
CN1032959C (zh) 1996-10-09
DE68922208T2 (de) 1995-08-10
CN1045243A (zh) 1990-09-12
EP0386309A2 (en) 1990-09-12
JPH02266909A (ja) 1990-10-31
ES2070872T3 (es) 1995-06-16
DE68922208D1 (de) 1995-05-18
EP0386309A3 (en) 1991-07-03
US4979892A (en) 1990-12-25
JP2716539B2 (ja) 1998-02-18
CA1274369A (en) 1990-09-25

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